An ideal GPS for navigators looking for extremely accurate vessel position and speed updates. Unlike other position-only antennas, Simrads GS25 GPS Antenna offers an integrated magnetic heading for exact boat direction (at any speed), rapid signal acquisition, as well as radar and chart overlays. Compact and waterproof construction for easy pole or surface mounting to virtually any vessel. Easily connects to any Simrad NS Series multifunction display or any NMEA 2000 network. Not for use with MARPA or autopilot which require a rate compass. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: GPS Antennas.